Allow form.save() in CreateView / UpdateView (#374)

django-stubs/views/generic/edit.pyi

@@ -1,28 +1,35 @@
 from typing import Any, Callable, Dict, Optional, Sequence, Type, Union
 
 from django.forms.forms import BaseForm
+from django.forms.models import BaseModelForm
 from django.views.generic.base import ContextMixin, TemplateResponseMixin, View
 from django.views.generic.detail import BaseDetailView, SingleObjectMixin, SingleObjectTemplateResponseMixin
 from typing_extensions import Literal
 
 from django.http import HttpRequest, HttpResponse
 
-class FormMixin(ContextMixin):
+class AbstractFormMixin(ContextMixin):
     initial: Dict[str, Any] = ...
     form_class: Optional[Type[BaseForm]] = ...
     success_url: Optional[Union[str, Callable[..., Any]]] = ...
     prefix: Optional[str] = ...
     def get_initial(self) -> Dict[str, Any]: ...
     def get_prefix(self) -> Optional[str]: ...
-    def get_form_class(self) -> Type[BaseForm]: ...
-    def get_form(self, form_class: Optional[Type[BaseForm]] = ...) -> BaseForm: ...
     def get_form_kwargs(self) -> Dict[str, Any]: ...
     def get_success_url(self) -> str: ...
+
+class FormMixin(AbstractFormMixin):
+    def get_form_class(self) -> Type[BaseForm]: ...
+    def get_form(self, form_class: Optional[Type[BaseForm]] = ...) -> BaseForm: ...
     def form_valid(self, form: BaseForm) -> HttpResponse: ...
     def form_invalid(self, form: BaseForm) -> HttpResponse: ...
 
-class ModelFormMixin(FormMixin, SingleObjectMixin):
+class ModelFormMixin(AbstractFormMixin, SingleObjectMixin):
     fields: Optional[Union[Sequence[str], Literal["__all__"]]] = ...
+    def get_form_class(self) -> Type[BaseModelForm]: ...
+    def get_form(self, form_class: Optional[Type[BaseModelForm]] = ...) -> BaseModelForm: ...
+    def form_valid(self, form: BaseModelForm) -> HttpResponse: ...
+    def form_invalid(self, form: BaseModelForm) -> HttpResponse: ...
 
 class ProcessFormView(View):
     def get(self, request: HttpRequest, *args: str, **kwargs: Any) -> HttpResponse: ...